[RedFury]

Beat me to it Gomer. We need to see if there is a drain on the battery first ( showing a semblance of a complete starter circuit ).

Give us the Make, Model and year of the car and it may help to narrow this down for you.

And for future reference when cleaning engine bays, high pressure=Bad. The only time I use direct high pressure when cleaning the engine compartment is if I'm trying to blast off grim from a solid surface such as the engine block ( NO ELECTRONICS ).

IF you see your headlights dim, then you know that there is something going on with the ignition/start circuit and you can most likely eliminate a bad ignition switch/connections.

Here's the thing to do....pull apart all the pull apart wiring connections under the hood and make sure there isn't any water in them shorting anything out. You can use WD40 as a water displacer, but your better off with a little compressed air.